import java.util.*;
public class Example3_9 {
	public static void main (String args[]) {
       Scanner reader = new Scanner(System.in);
       double sum = 0;
       int m = 0;
       while(reader.hasNextDouble()) {
           double x = reader.nextDouble();
           m = m+1;
           sum = sum+x;
       }
       System.out.printf("%d个数的和为%f\n",m,sum);
       System.out.printf("%d个数的平均值为%f\n",m,sum/m);
	}
}
